/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.phoenix.repository.query.lucene;

import java.util.Iterator;
import java.util.LinkedList;

/**
 * 阻塞队列,在没有内容时阻塞进程 Jigsaw server
 * 
 * @author <a href="shamphone@gmail.com">Li XiongFeng</a>
 * @date 2012-2-14
 * @version 1.0.0
 */
public class BlockedQueue<T> {
	LinkedList<T> queue = new LinkedList<T>();

	public synchronized void addItem(T o) {
		if (!queue.contains(o))
			queue.addLast(o);
		notify();
	}
	
	public synchronized void addAll(Iterator<T> items) {
		while(items.hasNext()){
			T item = items.next();
		if (!queue.contains(item))
			queue.addLast(item);
		}
		notify();
	}

	public synchronized T getItem() throws InterruptedException {
		while (queue.isEmpty()) {
			wait();
		}
		return queue.removeFirst();
	}

}
